(under the class definition) Subject matter wherein significance is attributed to a typewriter capable of imprinting character* symbols on a music roll, or capable of imprinting character symbols representing the notes used for indicating the signs and tones of a musical composition.
(1) Note. A "music roll" is a web of record-medium* having holes therein, the holes controlling the playing of a "player piano". In the typewriter of this subclass the music roll is also imprinted with the words of the song being played on the player piano, so that a user may sing along with the music being played.
